The Default JMS Host

A JMS host refers to a Sun Java System Message Queue broker. A default
JMS host for the JMS service is provided, named default_JMS_host.
This is the JMS host that the Application Server instance starts when the JMS Service
type is configured as LOCAL.

If you have created a multi-broker cluster in the Message Queue software,
delete the default JMS host, then add the Message Queue cluster’s brokers
as JMS hosts. In this case, the default JMS host becomes the first JMS host
in the AddressList. (For more information
about the AddressList, see JMS Connection Features. You can also explicitly set the default JMS host;
see Configuring the JMS Service.

When the Application Server uses a Message Queue cluster, it executes Message
Queue specific commands on the default JMS host. For example, when a physical
destination is created for a Message Queue cluster of three brokers, the command
to create the physical destination is executed on the default JMS host, but
the physical destination is used by all three brokers in the cluster.